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US20040070127A1 - Torsion bar for a seat belt retractor - Google Patents

Torsion bar for a seat belt retractor Download PDF

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Publication number
US20040070127A1
US20040070127A1 US10/648,305 US64830503A US2004070127A1 US 20040070127 A1 US20040070127 A1 US 20040070127A1 US 64830503 A US64830503 A US 64830503A US 2004070127 A1 US2004070127 A1 US 2004070127A1
Authority
US
United States
Prior art keywords
torsion bar
gear
bar
rolling
circumferential groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/648,305
Other languages
English (en)
Inventor
Klaus Junker
Andreas Tull
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Joyson Safety Systems Inc
Original Assignee
Joyson Safety Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Assigned to BREED AUTOMOTIVE TECHNOLOGY, INC. reassignment BREED AUTOMOTIVE TECHNOLOGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JUNKER, KLAUS, TULL, ANDREAS
Application filed by Joyson Safety Systems Inc filed Critical Joyson Safety Systems Inc
Assigned to KEY SAFETY SYSTEMS, INC. reassignment KEY SAFETY SYSTEMS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BREED AUTOMOTIVE TECHNOLOGY, INC.
Publication of US20040070127A1 publication Critical patent/US20040070127A1/en
Assigned to CITICORP USA, INC. reassignment CITICORP USA, INC. SECURITY AGREEMENT Assignors: AEGIS KEY CORP, BREED AUTOMOTIVE TECHNOLOGY, INC, HAMLIN ELECTRONICS LIMITED PARTNERSHIP, HAMLIN INCORPORATED, KEY ASIAN HOLDINGS, INC, KEY AUTOMOTIVE ACCESSORIES, INC, KEY AUTOMOTIVE OF FLORIDA, INC, KEY AUTOMOTIVE WEST, INC, KEY AUTOMOTIVE, LP, KEY CAYMAN GP LLC, KEY ELECTRONICS OF NEVADA, INC, KEY INTERNATIONAL MANUFACTURING DEVELOPMENT CORPORATION, KEY SAFETY RESTRAINT SYSTEMS, INC, KEY SAFETY SYSTEMS FOREIGN HOLDCO, LLC, KEY SAFETY SYSTEMS OF TEXAS, INC, KEY SAFETY SYSTEMS, INC, KSS ACQUISITION COMPANY, KSS HOLDINGS, INC
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/341—Belt retractors, e.g. reels comprising energy-absorbing means
    • B60R22/3413—Belt retractors, e.g. reels comprising energy-absorbing means operating between belt reel and retractor frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H5/00—Making gear wheels, racks, spline shafts or worms
    • B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
    • B60R2022/287—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material of torsion rods or tubes

Definitions

  • the present invention relates to a torsion bar and at least one gear that can be installed in a seat belt retractor as an energy absorber.
  • DE 196 53 510 A1 teaches the use of a torsion bar as an energy absorber in a belt reel of a seat belt retractor.
  • a torsion bar In order to connect the torsion bar in a non-rotatable manner with a lockable part of the belt reel, for instance a toothed disk and with a belt reel part which can be rotated in the case of overloading, gears are located on the two ends and/or in the bar region between the two ends on the torsion bar. Gears corresponding to the toothed disc and the rotatable belt reel part engage the gears located on the torsion bar.
  • the torsion bars with the anchoring gears associated therewith are manufactured in a conventional manner by compression molding.
  • At least one gear is created by rolling of the torsion bar material that is preferably arranged at an end of the torsion bar or in the proximity of the bar end.
  • the bar end can comprise a surrounding flange, in the proximity of which the gear is arranged.
  • the flange is located on the bar end on which a toothed disc associated with a lockable gear is to be connected in a non-rotatable manner with the adjacent gear.
  • the flange is used as a catch for axial fixation of the toothed disc.
  • a circumferential groove is located, which works as a “relief groove” and prevents an influencing of the shaping during the production of the gear by the rolling process. It is preferable that during the shaping of the gear through rolling, the circumferential groove that acts as a relief groove is also formed by rolling.
  • the groove is preferably deeper in a radial direction than the gear.
  • the shaping of the gear preferably takes place using two rolling cylinders that are diametrically set up on the bar material and have forming gears on their peripheries.
  • the two rolling cylinders are put to use on diametrically opposed sides of the bar material.
  • the surrounding flange can be provided on the bar end prior to the rolling process, for instance by molding.
  • the side of the flange turned towards the gear can preferably serve as a support surface for the rolling tool, namely the rolling cylinder.
  • the rolling tool in each case can be designed in such a manner that the required insertion, the circumferential groove, is also molded during the rolling process, during which the gear, namely the anchoring gear, is impressed in the bar material.
  • the rolling tool apart from the shaping contour for the gear, also comprises the shaping contour for the formation of the circumferential groove.
  • FIG. 1 is a perspective view of an embodiment of the torsion bar with two gears, namely anchoring gears, located on the ends of the bar.
  • FIG. 2 shows the embodiment of FIG. 1 with a toothed disc connected on one end of the torsion bar in a non-rotatable manner one of the gears.
  • FIG. 3 is a side view of the embodiment illustrated in FIG. 2.
  • FIG. 4 is a sectional representation of the embodiment of FIG. 3 taken along line 4 - 4 of FIG. 2.
  • FIG. 5 shows an embodiment for a bar end provided with a gear and on which a toothed disc can be secured in accordance with FIGS. 2 to 4 .
  • FIG. 6 is a sectional representation of the embodiment of FIG. 5 taken along line 6 - 6 of FIG. 5.
  • FIG. 7 is a sectional representation of a further embodiment of a bar end provided with a gear.
  • FIG. 8 is a sectional representation of a further embodiment of a bar end provided with a gear, on which a toothed disc can be secured.
  • FIG. 9 is a sectional representation of diametrically arranged rolling tools that are arranged at a distance from the bar end.
  • FIG. 10 is a sectional representation of the arrangement of the rolling cylinders on the bar end during the rolling process with a second embodiment of rolling cylinders.
  • FIG. 11 is a sectional representation of a third embodiment of a rolling cylinder.
  • the embodiment of a torsion bar shown in the figures comprises a torsion bar 1 ,on the two ends of which gears 2 , 3 integral with the torsion bar are located.
  • a surrounding flange 14 can be located on the bar end, projecting radially beyond the gear. This surrounding flange 14 serves as a catch for the axial and secure positioning of the toothed disc 16 on the torsion bar.
  • a second gear 3 is located on the other end of the torsion bar 1 .
  • a not further represented belt reel part is also connected to second gear 3 in a non-rotatable and positive locking manner. The seat belt webbing is wound up on this rotatable belt reel part in a known manner.
  • the toothed disc 16 comprises on its circumferential periphery a toothed rim in the form of a crown gear, which acts as a locking gear 9 .
  • a not further represented locking element supported on the belt retractor frame for instance in the form of a latch, can engage the locking gear 9 to lock the belt reel against further rotation on the belt retractor frame in a known manner, in particular in the direction of the belt extraction.
  • the toothed disc 16 For the purpose of a non-rotatable connection of the toothed disc 16 with the torsion bar, the toothed disc 16 comprises an inner lying toothed rim, which engages the second gear 3 in a positive locking, that is to say an interlocking, manner as shown in FIG. 4. It can also be seen from FIG. 4 that the toothed disc 16 lies against the surrounding flange 14 .
  • this belt reel part can rotate against the toothed disc 16 locked against rotation. In this type of rotation the torsion bar 1 is twisted, whereby energy is used.
  • the two gears, or at least the first gear 2 adjacent to the surrounding flange 16 are molded onto the torsion bar material by a rolling process.
  • a circumferential groove 5 is also formed by a rolling process on the bar end, on which the surrounding flange 14 is located.
  • the circumferential groove 5 is located between the surrounding flange and the first gear 2 , as can be seen in FIGS. 5 to 9 .
  • the torsion bar can provide the base material with a molded flange 14 prior to the rolling process.
  • the side of the flange 14 facing towards the gear can serve as a support surface for the rolling tool, namely the rolling cylinder.
  • two rolling tools 10 are brought into use, which comprise shaping gears 11 on their peripheral surfaces.
  • the toothed rims 11 the first gear 2 is formed by plastic deformation of the bar material.
  • two rolling tools are set up on the torsion bar in a diametrically opposed arrangement as shown in FIG. 10. Due to a surrounding shaping projection 12 on each rolling tool 10 , the circumferential groove 5 is simultaneously molded into the bar material between the surrounding flange 14 and the first gear 2 .
  • the groove 5 extends more deeply into the bar material in a radial direction than the circumferential periphery of first gear 2 . Accordingly, the surrounding shaping projection 12 is higher than the shaping gear 11 on the rolling tool 10 , as shown in FIGS. 9 to 11 .
  • a pushing away of the material during the rolling in an axial direction of the torsion bar is avoided by the support surfaces 13 .
  • the torsion bar is to this effect adjacent to the support surfaces 13 in the region of the flange 14 and at least of the first gear 2 , flush with the tool.
  • the process being brought into use in the invention is defined in that for the formation on the torsion bar of the gears 2 and/or 3 the corresponding bar parts are rolled, and by plastic deformation of the bar material a gear 2 , 3 is created. It is preferred that at the same time as this rolling process the circumferential groove 5 is also molded into the bar material between the flange 14 on the bar end and the first gear 2 at the same time by the rolling process.
  • two rolling tools 10 namely rolling cylinders, are used, which are set up on the bar material in a diametrically opposed manner.
  • the bar material is therefore, as is shown in FIG. 10, positioned between the two rolling tolls 10 , which are rotated around their axes 8 in each case.
  • FIGS. 9 and 10 the tool positioned in each case on the bar material is represented in a sectional view.
  • the two rolling tools are loaded with a cylinder force radially directed to the bar material, whereby the plastic deformation of the bar material which is weaker than the tool material, correspondingly takes place.
  • the support surfaces 13 can serve as support surfaces on the two ends of the rolling, as is shown in FIG. 11, or only essentially on the side of the flange, as shown in FIG. 10, or they can be absent, as shown in FIG. 9.
  • the groove 5 can have various shapes.
  • the groove comprises side boundary surfaces running essentially parallel, as they are projecting in a radial direction.
  • the cross section of the groove 5 is essentially U-shaped.
  • the groove 5 comprises obliquely running side boundary surfaces.
  • the cross section of the groove is essentially V-shaped.
  • the groove 5 comprises a side boundary surface running obliquely to the bar axis and a side boundary surface running essentially perpendicularly to the bar axis.
  • the obliquely running side boundary surface is adjacent to the flange 5 and the side boundary surface running perpendicularly to the bar axis is adjacent to the first gear 2 .
  • FIG. 9 shows rolling tools 10 that are suitable for the production of the embodiment shown in FIGS. 7 and 10 shows rolling tools 10 that are suitable for the production of the embodiment shown in FIG. 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)
US10/648,305 2002-10-15 2003-08-27 Torsion bar for a seat belt retractor Abandoned US20040070127A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20215831.4 2002-10-15
DE20215831U DE20215831U1 (de) 2002-10-15 2002-10-15 Torsionsstab für einen Energieabsorber eines Sicherheitsgurtaufrollers

Publications (1)

Publication Number Publication Date
US20040070127A1 true US20040070127A1 (en) 2004-04-15

Family

ID=7975987

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/648,305 Abandoned US20040070127A1 (en) 2002-10-15 2003-08-27 Torsion bar for a seat belt retractor

Country Status (2)

Country Link
US (1) US20040070127A1 (de)
DE (1) DE20215831U1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100320303A1 (en) * 2003-12-11 2010-12-23 Sfs Intec Holding Ag Torsion bar for application in belt winders for safety belts
USD1062408S1 (en) * 2022-09-15 2025-02-18 Chin-Sung Huang Ratchet gear for a seat belt adjuster

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004011498A1 (de) * 2004-03-09 2005-09-29 Trw Automotive Gmbh Torsionsstab für einen Gurtaufroller sowie Gurtaufroller
EP2276652B1 (de) * 2008-05-16 2014-06-25 Autoliv Development AB Selbstsperrender gurtaufroller

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1329535A (en) * 1920-02-03 Engine-starter
US1893572A (en) * 1931-02-14 1933-01-10 Wildhaber Ernest Gearing
US2315781A (en) * 1942-11-02 1943-04-06 Kensington Steel Company Rack and pinion for excavating shovel handles
US5037038A (en) * 1990-02-09 1991-08-06 Occupant Safety Systems, Inc. Dual mode seat belt retractor
US6609672B2 (en) * 2001-06-19 2003-08-26 Breed Automotive Technology, Inc. Seat belt retractor spool
US6641075B2 (en) * 2001-05-11 2003-11-04 Brees Automotive Technology, Inc. Seat Belt Retractor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1329535A (en) * 1920-02-03 Engine-starter
US1893572A (en) * 1931-02-14 1933-01-10 Wildhaber Ernest Gearing
US2315781A (en) * 1942-11-02 1943-04-06 Kensington Steel Company Rack and pinion for excavating shovel handles
US5037038A (en) * 1990-02-09 1991-08-06 Occupant Safety Systems, Inc. Dual mode seat belt retractor
US6641075B2 (en) * 2001-05-11 2003-11-04 Brees Automotive Technology, Inc. Seat Belt Retractor
US6609672B2 (en) * 2001-06-19 2003-08-26 Breed Automotive Technology, Inc. Seat belt retractor spool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100320303A1 (en) * 2003-12-11 2010-12-23 Sfs Intec Holding Ag Torsion bar for application in belt winders for safety belts
USD1062408S1 (en) * 2022-09-15 2025-02-18 Chin-Sung Huang Ratchet gear for a seat belt adjuster

Also Published As

Publication number Publication date
DE20215831U1 (de) 2003-01-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BREED AUTOMOTIVE TECHNOLOGY, INC., FLORIDA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JUNKER, KLAUS;TULL, ANDREAS;REEL/FRAME:014449/0417

Effective date: 20030818

AS Assignment

Owner name: KEY SAFETY SYSTEMS, INC., MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BREED AUTOMOTIVE TECHNOLOGY, INC.;REEL/FRAME:014968/0578

Effective date: 20040205

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: CITICORP USA, INC., NEW YORK

Free format text: SECURITY AGREEMENT;ASSIGNORS:KEY SAFETY SYSTEMS, INC;KSS HOLDINGS, INC;KSS ACQUISITION COMPANY;AND OTHERS;REEL/FRAME:019297/0249

Effective date: 20070308

Owner name: CITICORP USA, INC.,NEW YORK

Free format text: SECURITY AGREEMENT;ASSIGNORS:KEY SAFETY SYSTEMS, INC;KSS HOLDINGS, INC;KSS ACQUISITION COMPANY;AND OTHERS;REEL/FRAME:019297/0249

Effective date: 20070308